实现JSP快速上传文件的方法

package FileUpload;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import javax.servlet.ServletInputStream;/** *  *//** * @author Qch *  */public class FileUpload{  ServletInputStream in=null;  String fpath="C://";  public FileUpload()  {    fpath="C://";    in=null;  }  public void setInputStream(ServletInputStream in)  {    this.in=in;  }  public void setFpath(String p)  {    this.fpath=p;  }  public String getFpath()  {    return fpath;  }  public String getParameter()  {     String r=null;    try    {      r=getParameter(in);    }    catch (Exception e)    {      e.printStackTrace();    }    return r;  }  public long getFileUpload()  {    long r=-1;    try    {      r=getFileUpload(in,fpath);    }    catch (Exception e)    {      e.printStackTrace();    }    return r;  }  public String getParameter(ServletInputStream in)// 只能按顺序提取      throws Exception  {    int l = 0;    byte[] b = new byte[1024];    l = in.readLine(b, 0, b.length);// 依次是读取属性的开始符、名称、属性值的类型、属性的值    String si = new String(b);    if (si.startsWith("----------------------------"))    {// 表示是从开始符开始读，否则应为刚读取文件后的一个属性，此时应少读一次      l = in.readLine(b, 0, b.length);    }    l = in.readLine(b, 0, b.length);    l = in.readLine(b, 0, b.length);    String value = new String(b, 0, l);    return value;  }  public long getFileUpload(ServletInputStream in, String fpath)// 需要提供输入流和存储路径      throws Exception  {    // out.println("文件信息:");    long begin = System.currentTimeMillis();// 传送时间计时开始    int l = 0;    byte[] b = new byte[1024];    l = in.readLine(b, 0, b.length);    String sign = new String(b, 0, l);// eg.-----------------------------7d9dd29630a34    l = in.readLine(b, 0, b.length);    String info = new String(b, 0, l);// eg.Content-Disposition:form-data;    // name="file";    l = in.readLine(b, 0, b.length);    // String type=new    // String(b,0,l);//eg.Content-Type:application/octet-stream(程序文件)    l = in.readLine(b, 0, b.length);    // String nulll=new String(b,0,l);//此值应为空    int nIndex = info.toLowerCase().indexOf("filename=/"");    int nLastIndex = info.toLowerCase().indexOf("/"", nIndex + 10);    String filepath = info.substring(nIndex + 10, nLastIndex);    int na = filepath.lastIndexOf("//");    String filename = filepath.substring(na + 1);    // out.println("文件绝对路径："+filepath+"");    // out.println("文件名："+filename+"");    String path=fpath + filename;    File fi = new File(path);// 建立目标文件    if (!fi.exists()&&!fi.createNewFile())      return -2;    BufferedOutputStream f = new BufferedOutputStream(new FileOutputStream(        fi));    while ((l = in.readLine(b, 0, b.length)) > 0)    {      if (l == sign.length())      {        String sign1 = new String(b, 0, sign.length());        // out.println(sign1+"");        if (sign1.startsWith(sign))// 比对是否文件已传完          break;      }      f.write(b, 0, l);      f.flush();    }    f.flush();    f.close();    long end = System.currentTimeMillis();// 传送时间计时结束    // out.println("上传文件用时："+(end-begin)+"毫秒");    return end - begin;  }}

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%  String path = request.getContextPath();  String basePath = request.getScheme() + "://"      + request.getServerName() + ":" + request.getServerPort()      + path + "/";%>

<%@ page language="java" import="java.util.*,java.io.*"  pageEncoding="GB18030"%><%  String path = request.getContextPath();  String basePath = request.getScheme() + "://"      + request.getServerName() + ":" + request.getServerPort()      + path + "/";%>